Activating the rear window wiper and rear window washer
Select 
for intermittent wiping with the rear window wiper.
Select 
for continuous speed with the rear window wiper.
Move the right-hand steering wheel stalk switch forward to start rear window washing and wiping.
Automatic rear windscreen wiping when reversing
Engaging reverse gear while the windscreen wipers are switched on initiates rear window wiping. The function stops when reverse gear is disengaged.
Contact an authorised Volvo workshop in order to deactivate the function.
Note
In low outside temperature, the automatic rear window wiping when reversing is deactivated in order to avoid damage to the wiper arm.